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libkvm/kvm_open.3: document broken full dumps

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Starting 13.1 the amd64 kernel was made relocatable, but the kernel
didn't provide enough information for libkvm to figure out where it was
loaded.

Reviewed by: markj
Approved by: imp (mentor)
Pull Request: https://github.com/freebsd/freebsd-src/pull/1706
Closes: https://github.com/freebsd/freebsd-src/pull/1706
This commit is contained in:
Ahmad Khalifa 2025-05-22 15:44:57 +03:00
parent 308659acbf
commit 2e91875bc2
1 changed files with 14 additions and 1 deletions
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15
lib/libkvm/kvm_open.3
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@ -29,7 +29,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd March 20, 2017
.Dd June 22, 2025
.Dt KVM_OPEN 3
.Os
.Sh NAME
@ -245,7 +245,20 @@ The value passed via
was
.Dv NULL .
.El
.Sh NOTE
Full memory dumps taken on 13.x (excluding 13.0) and 14.x amd64 kernels
will cause both
.Fn kvm_open
and
.Fn kvm_open2
to fail since they do not provide sufficient information to figure out
where in physical memory the kernel was loaded.
Full memory dumps have to be explicitly enabled by setting the
.Va debug.minidump
.Xr sysctl 8
to 0.
.Sh SEE ALSO
.Xr dumpon 8 ,
.Xr close 2 ,
.Xr open 2 ,
.Xr kvm 3 ,